Safety Syringe Device

Abstract

A safety syringe device is composed of a syringe tube having a medicine compartment, a push rod penetrating through the medicine compartment, a needle seat screw engaging with the push rod at a top pusher where the push rod is emerged out of its interior threaded section, a needle base with a needle stem set on it is enclosed by a needle protector; wherein the syringe tube has an interior threaded section and a positioning screw thread formed at the interior of its front end. The needle seat is provided with an exterior threaded section around its outer circumference to screw combine with the positioning screw thread of the syringe tube, and with its guide flange to engage the needle protector which encloses the needle base with the interior threaded section such that the needle base is able to revolve on the needle seat towards its core bit and contact the core bit with its sloped surface thereby tightly setting the needle seat and needle base on the syringe tube.

1 . A safety syringe device comprising:
 a syringe tube with a medicine compartment which is provided with an interior threaded section and a positioning screw thread at its front end in order;   a push rod penetrating through said syringe tube and having a top pusher with a jut on its top; wherein the diameter of said jut is slightly larger than that of said top pusher on its top, several aligning clogs are disposed around the lower exterior circumference of said top pusher, and a ferrule is formed immediately below, and beneath said ferrule there is formed a neck portion of reduced diameter;   a needle seat having a core bit of reduced diameter at the front end thereof, a central path being longitudinally passing through it and a stopper being provided therein, and an accommodation cavity formed at the rear end of said needle seat, and several fixing blocks provided around the surface of said accommodation cavity, between said two adjacent fixing blocks there being formed a barrier space to trap the aligning clog of said push rod, an exterior threaded section being formed around the exterior circumference of said accommodation cavity to screw engage with the positioning screw thread of said syringe tube; and   a needle base having a needle stem provided at one end thereof, while a guide flange formed at the other end thereof to screw engage with the interior threaded section of said syringe tube such that said needle base is able to revolve along said needle seat and brings its sloped surface to fit on said core bit.   
   
   
       2 . The safety syringe device of  claim 1 , wherein said aligning clog of said push rod has a guide surface at its front end sloping down to two sides from the center. 
   
   
       3 . The safety syringe device of  claim 1 , wherein the bottom of said fixing block of said needle seat is configurated into a sloping surface down to two sides from its center portion. 
   
   
       4 . A safety syringe device comprising:
 a syringe tube with a medicine compartment which is provided with an inner positioning screw thread at the front end thereof,   a push rod penetrating through said syringe tube and having a top pusher with a jut on its top; wherein the diameter of said jut is slightly larger than that of said top pusher on its top, several aligning clogs are disposed around the lower exterior circumference of said top pusher, and a ferrule is formed immediately below, and beneath said ferrule there is formed a neck portion of reduced diameter; and   a needle seat having a core bit of reduced diameter at the front end thereof, a central path being longitudinally passing through it and a stopper being provided therein, and an accommodation cavity formed at the rear end of said needle seat, and several fixing blocks provided around the surface of said accommodation cavity, between said two adjacent fixing blocks there being formed a barrier space to trap the aligning clog of said push rod, an exterior threaded section being formed around the exterior circumference of said accommodation cavity to screw engage with the positioning screw thread of said syringe tube.   
   
   
       5 . The safety syringe device of  claim 4 , wherein said aligning clog of said push rod has a guide surface at its front end sloping down to two sides from the center. 
   
   
       6 . The safety syringe device of  claim 4 , wherein the bottom of said fixing block of said needle seat is configurated into a sloping surface down to two sides from its center portion. 
   
   
       7 . The safety syringe device of  claim 4 , said syringe device further comprises a needle protector set on said needle base to enclose and protect said needle base and said needle stem. 
   
   
       8 . The safety syringe device of  claim 4 , wherein after being finished injection, said push rod is continued to be pushed forwards until said jut is detained by the top end of a stopper provided on said core bit, afterwards turning said push rod in the reverse direction to drive said needle seat retreat along the helical route of said positioning screw thread so as to liberate its exterior threaded section out of the detention of said positioning screw thread, and also liberate the entire needle seat pout of the detention of said interior threaded section of said syringe tube. 
   
   
       9 . A safety syringe device comprising:
 a syringe tube with a medicine compartment which is provided with a positioning screw thread interior of its front end;   a push rod penetrating through said syringe tube and having a jut on the top end thereof, several aligning clogs being disposed around its exterior circumference beneath said jut, and a ferrule being formed immediately below said clogs; and   a needle seat with a needle stem directly adhered to one end thereof, and an accommodation cavity connected to its path, several fixing blocks and a stopper being provided around the surface of said accommodation cavity, between two adjacent fixing blocks there being formed a barrier space to trap said clog of said push rod, and an exterior threaded section being formed around the external circumference of said accommodation cavity to screw engage with said positioning screw thread of said syringe tube.